It's Elemental: Protactinium - Basic physical and historical information.
ChemicalElements.com: Protactinium - Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Protactinium - Atomic structure, chemical and physical properties, and table of nuclides.
Radiochemistry of Protactinium - Full text of the monograph by H. W. Kirby (Mound Laboratory, Miamisburg, Ohio).
WebElements: Protactinium - Extensive information on history, uses, occurrence, compounds, and properties.
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